1. (adj) baneful, deadly, pernicious, pestilent
exceedingly harmful
Synonyms: pernicious, pestiferous, deathly, virulent, baneful, venomous, baleful, mortal, insidious, lethal, pestilent, deadly, plaguey, subtle, pestilential, mortal(a)
Antonyms: endemical, ecdemic, innocuous, endemic
2. (adj) pestilent, pestilential, pestiferous, plaguey
likely to spread and cause an epidemic disease
Synonyms: pestilent, pernicious, corruptive, teasing, nettlesome, vexing, baneful, galling, dirty, plaguy, bothersome, plaguey, pestiferous, vexatious, deadly, pesky, pestering, annoying, pestilential, perversive, irritating
Antonyms: endemical, innocuous, ecdemic, endemic
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Synonyms for pestilent 
